MOIST

Program to predict combined transfer
of heat and moisture in multi-layer
building construction. Inputs hourly
weather data from diskette and
predicts the moisture content and
temperature of the construction
layers as a function of time of year.
Can be used to develop guidelines
and practices for controlling moisture
in walls, flat roofs, and cathedral
ceilings.

Keywords

combined heat and moisture transfer, envelope

Validation/Testing

N/A

Expertise Required

Low to moderate level of computer literacy; most users require about 3 hours to learn how to use the program.

Users

Over 1250.

Audience

Building engineers, architects, consultants.

Input

Output

Moisture content of the construction layers is plotted versus time of year on the computer screen during program execution; in addition, various formatted output files are generated for subsequent analysis.

Computer Platform

PC-compatible, 486 or higher; Windows 3.1/95/98/NT, and a VGA or higher resolution monitor.

Programming Language

Fortran, Visual Basic

Strengths

User- friendly; predicts detailed hourly heat and moisture performance of building components. Can be used to generate guidelines and practices for controlling moisture.

Weaknesses

One-dimensional; does not include the transfer of heat and moisture by air movement.

Contact

Company:

National Institute of Standards and Technology

Address:

Building and Fire Research Laboratory
100 Bureau Drive, Stop 8632
Gaithersburg, Maryland 20899-8632
United States